SQL Introduction

The Structured Query Language(SQL) is a language that enables you to create and operate on relational databases, which are sets of related information stored in tables. SQL has proved to be a standard language as it allows users to learn one set of commands and use it to create, retrieve, alter, and transfer information regardless of whether they are working on a PC, a work station, a mini, or a mainframe.
There are numerous versions of SQL. The original version was developed at IBMís San Jose Research Laboratory(now the Almanden Research Center). This language originally called Sequel, was implemented as part of the System R project in early 1970s. the Sequel language has evolved since then and its name has changed to SQL. In 1986, the American National Standards Institute(ANSI) published an SQL standard that was updated again in 1992.
SQL has clearly established itself as the standard relational database language. Letís see a brief presentation of SQL.

SQL statements are used for:

Writing SQL statements:

Types of SQL


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